Re: panic: reassignbuf: dup lblk vp 0xffffffe0136df000 bp 0xffffffe00d

Hi Yonetani,

There was a correction on February 3th specifically for x86_64. I
don't know if that's related to the panic somehow or not, but
definitely for the rebalance issue you're having.

http://gitweb.dragonflybsd.org/dragonfly.git/commit/7a3eee88d3ffab887e1b2d812672f20071d39947

Cheers,
Antonio Huete

2011/2/9 YONETANI Tomokazu <[e-mail]>:
> Hello.
> Caught this panic this morning during `hammer cleanup' on a Atom D510
> based system with 4G bytes of RAM installed and running x86_64 kernel.
> It was running pbulk at the same time. 糍he kernel was built from source
> s of 8d2576868. 糍he `insufficient buffers to rebalance the tree' warnings
> have been observed before the system panicked. 糍he global variable nbuf
> (which holds the value for vfs.nbuf sysctl node) contains 1475 in the kgdb
> session, which is much lower than the value seen on other systems running
> 32-bit kernel.
>
> ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀺ
> 啫eb ꀹ 05:05:09 atom64 kernel: hammer: System has insufficient buffers to rebalance the tree. 滢buf < 3969
> 啫eb ꀹ 05:19:01 atom64 kernel: hammer: System has insufficient buffers to rebalance the tree. 滢buf < 3969
> 啫eb ꀹ 05:27:23 atom64 syslogd: kernel boot file is /boot/kernel/kernel
> 啫eb ꀹ 05:27:23 atom64 kernel: panic: reassignbuf: dup lblk vp 0xffffffe0136df000 bp 0xffffffe00df730b0
>
> And the backtrace follows:
>
> #4 ꀰxffffffff802a9c1e in panic (
> ꀠ沲mt=0xffffffff80530140 "reassignbuf: dup lblk vp %p bp %p")
> ꀠ乸t /usr/src/sys/kern/kern_shutdown.c:799
> #5 ꀰxffffffff8031262f in reassignbuf (bp=0xffffffe00df730b0)
> ꀠ乸t /usr/src/sys/kern/vfs_subr.c:1046
> #6 ꀰxffffffff802fa526 in bundirty (bp=0xffffffe00df730b0)
> ꀠ乸t /usr/src/sys/kern/vfs_bio.c:1247
> #7 ꀰxffffffff802fe705 in bawrite (bp=0xffffffe00df730b0)
> ꀠ乸t /usr/src/sys/kern/vfs_bio.c:1025
> #8 ꀰxffffffff802fe98a in vfs_bio_awrite (bp=0xffffffe00df730b0)
> ꀠ乸t /usr/src/sys/kern/vfs_bio.c:1937
> #9 ꀰxffffffff802fedae in flushbufqueues (q=BQUEUE_DIRTY)
> ꀠ乸t /usr/src/sys/kern/vfs_bio.c:2694
> #10 0xffffffff802ff041 in buf_daemon () at /usr/src/sys/kern/vfs_bio.c:2525
> #11 0xffffffff8029961e in suspend_kproc (td=0x0, timo=0)
> ꀠ乸t /usr/src/sys/kern/kern_kthread.c:189
> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
> (kgdb) fr 5
> #5 ꀰxffffffff8031262f in reassignbuf (bp=0xffffffe00df730b0)
> ꀠ乸t /usr/src/sys/kern/vfs_subr.c:1046
> 1046 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ漤anic("reassignbuf: dup lblk vp %p bp %p",
> (kgdb) l
> 1041 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ毪uf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
> 1042 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ毪p->b_flags &= ~B_VNDIRTY;
> 1043 ꀠꀠꀠꀠꀠꀠꀠꀠꀠ
> 1044 ꀠꀠꀠꀠꀠꀠꀠꀠꀠ湶f ((bp->b_flags & B_VNCLEAN) == 0) {
> 1045 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ湶f (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
> 1046 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ漤anic("reassignbuf: dup lblk vp %p bp %p",
> 1047 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ炻p, bp);
> 1048 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ
> 1049 ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ毪p->b_flags |= B_VNCLEAN;
> 1050 ꀠꀠꀠꀠꀠꀠꀠꀠꀠ
> (kgdb)
>
> Best Regards,
> YONETANI Tomokazu.
>